Although the Guardian drone is only a single use weapon, it is mobile, whereas both the U.S. Army's and the Consortium's counter-tactical weapons are fixed. The advantage of that is that it can be placed anywhere but needs some protection because of their somewhat average armor and slow speed. Moreover, apart from it being able to run over infantry, the vehicle is otherwise unarmed. This can be offset with their speed and distance upgrade which will make the Guardian Drone that much better and easier to deploy quickly.
Speed and distance upgrade Costs $2500. All drones are now twice as fast, and can protect a 100% larger zone vs enemy tactical weapon.